Two stroke cycle internal combustion engine



Dec. 1, 1931. H. scHLUP-MANN 1,834,651

TW-STROKE CYCLE INTERNAL 'COMBUSTION ENGINE Filed April 22, 1929 l Inventor: JMW.,

by A Home] 35 ing a piston 46 reciprocating therein Patentedk Dec. 1, 1 9314 UNITED STATES PATENT OFFICE T'WO STROKE `CYCLE INTERNAL COMBUSTION ENGINE Application led April 22, 1929, Serial No.` 357,280, and in Germany January 19, 1926.

My invention relates to improvements in.

1o of the cylinder connected with said chamber, the said tubular extension of the piston being provided with slots controlling the admission of pressure fluid from said chamber to the work cylinder. The object of the improvements is to provide an engine -of this type in which the pressure fluid is admitted from said chamber to the work cylinder under uniform presure, and with this object in view my invention consists in supplying the pressure fluid to said chamber by means of a compressor or blower which is separate from the work piston.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawings,

in which the same letters of reference have been used in all the views to indicate corresponding parts. In said drawings,

` Fig. 1 is a sectional elevation showing the an engine, and

Fig. 2 is a sectional elevation taken on the line 2 2 of Fig. 1.

In the example shown in the figures the engine comprises four cylinders 45 each hav-l an the said pistons are provided with tubular extensions 47 passed through the cylinder head 48 into a pressure chamber 49 common to all the cylinders, the said pressure chamber being provided with a jacket 50 and pipes 51 communicating with the jacket 52 of the cylinder and adapted to have a cooling medium circulated therethrough.

The tubular extensionsV are closed at their top'ends by a substantially conical end wall 53, and above the said end wall the tubular extension is formed with slots 54.

In none of the positions of the pistons 46 the pressure chamber 49 is connected with the bottom part of thecylinder 45 and the crank casing. The pressure chamber is in communication with a work cylinder .only if the piston 46 is lin its lower dead center and the slots 54 open into the said work cylinder, as is shown in connection with the right hand cylinder shown in Fig. 2. In all the other positions of the pistons the pressure chambers 49 are disconnected from the work cylinders. Therefore, the compressed air or combustible mixture is delivered into the work cylinder only when the plunger is near or in its lower dead center, the air rushing into the cylinder, by reason of the curved form of the end wall 53 without producing whirls, so that an intermingling of the new charge and the burnt gas is to a large extent avoided.

When disposing the pressure chamber 49 abo-ve the cylinder and within the cooling jacket 50 it is heated by the cooling water which before has circulated around the cylinders 45, so that precipitation of fuel from the combustible mixture within the pressure chamber 49 is avoided. Further, the charge of the pressure chamber 49 is whirled around by the tubular extensions 47 passing into the same, so that the precipitationof fuel is further prevented. Further, the charge within the pressure chamber 49y has a -cooling effect on the tubular extensions 47. l

Combustible mixture is forced into the pressure chamber through an intake passage 55 froma compressor or blower. Preferably compressors or blowers are used which have a uniform operation, and which can be readily ignited.

In the construction shown in the figures combustible mixture is supplied to the pressure chamber. But I wish it to be understood that my invention is not limited to engines of the type in which fuel and air are mixed before being supplied to the'cylinder.

The exhaust ports 56 are provided near the bottom ends of the cylinders, and at the end oppositeto the intake ports 54. Therefore, the air and gas move through the cylinder in one direction.

The operation of the engine is as follows: In the position of the piston shown in Fig. 1 and at the right in Fig. 2 the burnt gas has been exhausted through the ports 56,-and a y fresh charge of air or combustible mixture rushes into the work cylinder from the chamber 49 through the ports 54, the said gas expelling the residue of burnt gas confined within the work cylinder. After the piston has begun its upward stroke the ports 54 and 56 are closed, and the charge is compressed within the work cylinder. At the end of the upward stroke of the piston ignition takes place, and the piston is thrown outwardly from the position shown at the left in Fig. 2 into the position shown at the right in the said figure.

By supplying the air or combustible mixture to the chamber 49 by means of a compressor or blower which is independent of the piston the pressure of the charge flowing into the work cylinder is practically not reduced during the whole admission period, so that a large amount of air or combustible mixture is supplied to the work cylinder.

I claim:

A two-stroke cycle internal combustion engine, comprising a cylinder, a casing located at one end of said cylinder and providing a presiure chamber, a. piston reciprocating in said cylinder and having` a tubular extension extending into said pressure chamber, crank mechanism connected with said piston, means separate from said piston for supplying Huid uirder pressure to said pressure chamber, said cylinder providing a Work chamber between said piston and said casing, said tubularextension being formedwith ports controlling the transmission of pressure Ifluid from said pressure chamber into said work chamber, said cylinder and casing. being formed with'jackets, and means for supplying a cooling medium iirst through the jacket of said cylinder and thereafterA through said jacket of the casino.

In testimony whereof I hereunto affix my signature.

HEINRICH SCHLPMANN. 

